public static T GetRandom <T>(this IEnumerable <T> enumerable)
{
if (enumerable.Count() == 0)
{
return(default(T));
}
int id = RandomEx.Next(enumerable.Count());
return(enumerable.ElementAt(id));
}
public static IEnumerable <int> NonRepeatableRandoms(int minValue, int maxValue, int count)
{
var result = new List <int>();
var values = Enumerable.Range(minValue, maxValue - minValue).ToList();
count = Math.Min(maxValue - minValue, count);
for (int i = 0; i < count; ++i)
{
int index = RandomEx.Next(values.Count);
result.Add(values[index]);
values.RemoveAt(index);
}
return(result);
}
